Decoupling control of pickup head motion in near-field optical disk drives

2003 ◽  
Author(s):  
T.S. Liu ◽  
P.C. Liu
Keyword(s):  
Near Field ◽  
Optical Disk ◽  
Decoupling Control ◽  
Head Motion ◽  
Disk Drives

Study of air bearing with grooved disk surface in near-field optical disk drives

2005 ◽  
Vol 41 (2) ◽  
pp. 1047-1049 ◽  
Author(s):  
H.C. Wang ◽  
T.S. Liu ◽  
C.S. Chang
Keyword(s):  
Near Field ◽  
Disk Surface ◽  
Optical Disk ◽  
Air Bearing ◽  
Disk Drives

Dynamic Analysis of the Optical Disk Drives Equipped with an Automatic Ball Balancer with Consideration of Torsional Motions

2005 ◽  
Vol 72 (6) ◽  
pp. 826-842 ◽  
Author(s):  
Paul C. P. Chao ◽  
Cheng-Kuo Sung ◽  
Chun-Chieh Wang
Keyword(s):  
Multiple Scales ◽  
Spindle Motor ◽  
Optical Disk ◽  
Torsional Stiffness ◽  
Torsional Motion ◽  
Disk Drives ◽  
Scaled Model ◽  
Supporting Plate ◽  
Steady State Solutions ◽  
Balanced Solution

This study is dedicated to evaluate the performance of an automatic ball-type balancer system (ABS) installed in optical disk drives (ODDs) with consideration of the relative torsional motion between the ODD case and the spindle-disk-ABS-turntable system, noting that the turntable is the supporting plate structure for disk, pickup, and spindle motor inside the ODD. To this end, a complete dynamic model of the ABS considering the torsional motion is established with assuming finite torsional stiffness of the damping washers, which provides suspension of the spindle-disk-ABS-turntable system to the ODD case. Considering the benchmark case of a pair of balancing balls in an ABS, the method of multiple scales is then applied to formulate a scaled model for finding all possible steady-state solutions of ball positions and analyzing corresponding stabilities. The results are used to predict the levels of residual vibration, with which the performance of the ABS can then be reevaluated. Numerical simulations are conducted to verify theoretical results. It is deduced from both analytical and numerical results that the spindle speed of an ODD could be operated above both primary translational and secondary torsional resonances in order to guarantee stabilization of the desired balanced solution for a substantial vibration reduction.

Sign in / Sign up

Export Citation Format

Share Document